For /var/lib/pgsql/data/global/pg_auth file, it exists on my VPS where I just installed postgres using /scripts/installpostgres command. How did you install postgres on your machine and how did you copy over data to your machine for the accounts?

Next, the /var/lib/pgsql/data/global/pg_auth file is used by cPanel with md5-based hash passwords. Here's an example from my machine: